Vibrating screen.



PAT-BNTED MAP.. 1s, 1906.

' l N. V.- FITTS.

VIBRATINGSGREEN.

APPLIOATION FILED DEO. 5, 1904.

PATBNTBD MAR. 13, 1906. N. V. PITTS. VIBRATING SCREEN'. 'APPLICATION FILED DIU. 5,1904.

4 SHEETS-SHEET 3.

witness@ wdwf' I @Hof/11u13 N. 'V. PITTS. VIBRATING SCREEN.

APPLICATION I'ILBD 1320.5, 1904.

4 SHEETS-SHEET 4 PATLNT'BD MAR.13,1'906.

- by the yaforesaid patent, all of which will bev `iully understood by reference to the accompanying drawings, vin ywhich illustrated an v No. 814,952,

d ci-tiien of the United States', residinginthe erence being'hadtothe accompanyingldraw'- ings, andA to the gures'ofreference marked n in sizing and yclassifying ypulveri'zed ore and f dated September 8,1903, andincludescershown on a larger scale than in Figs'. 1 and 2.

, v so A Ward the right'. y ",Figj? isa section taken on inasmuch as it greatly facilitates the subse- -tion whereby results are obtained superior material which passes through. theimesh of shown in Fi NORMAN V.

PA*LYEMv OFFICE l` f-spciaeationvbf Letters-Patent. ratenteamara 13,1906.

v ApplicatiafledDeember 5,1964. seraiNo. 236,465. l

To aglilvwhomz't concern Ble a known that i,l NORMAN. v.' Flers, {a

city'andcounty of Denver and State of Colo-j rado, have' invented certain new and useful; Improvements in Vibrating Screens ,and I do 5 declare thefollowi'ng to', lbe a full,fclea`r, and eXact description of the invention, such las will enableothers skilled in thel artvtowhich it appertains to make and V use the same, refthereon, whichl forma part 'of thisspecication. v l v My invention relates kto improvements`- in vibrating-screen -mechanismadapted for vuse v othermaterial Where vthe necessity fora ,classifying, grading, or .screening functionexists. Itis well `known` that -afthorough classiiication of pulverized ore is',eXceedinglydesirable,

quent treatment ofthefore for, thefpurposeof,

.recovering its metallicvalues. e j ,n

f My presentinventionrelates to the class of devices set forth inlatent No. 738,485,

tain novel features of construction and'iuncto those possible in Ithe construction covered embodiment 'thereof-.j i In the drawings, Figure a front elevation of my improvedr construction; .'Fig. 2

mechanisms one above another, Wherebythe one screenis passedto another vscreen of difseparate the material under treatment. Fig. 3 isa top plan view of the 'screen vmechanism- Fig. 4 is asideelevation-ofthe constuction CH3( Fig. 5 is a section taken approximately on the-linef 5, AFig. 3, viewed' in the directionof the arrow. Fig. -6 is asection taken on'the line 6 7 Fig. 3, looking to# the'sfamelinelooking toward lthe left., Fig.`

Sisan enlarged, detail view illustrating the rrrrs, or'DENVER,y coLoRADO, AssIGNoRro THE `c oLoi-nin'o f mannferof manipulating the. rocking waterl f lsupply lpipe from the shaft offthe multiple cam-wheel. Fig; 9 isy an enlarged` detail view of one of the lnozzles.connected-with Y said pipe. Figs'. 10V and 1 1 'area top view and a sectional elevation, respectively, of the ldistributingdevices-located inthe feed-chute.

' Thesame reference characters indicate the i same rparts in'. all the views.

Let the rnumeral 5 designate a suitable up-r right framework, to which is secured by bolts '6 a stationary frame-"7, on which is journaled a shaft8,to which is secured a pair of multi- .ple cam-wheels 9, arranged to act on parallel bars 10,]connectedby transverse bars 12,

suitable bars 14' and ,15. These parts 13, 141,

and 15, takeny collectively, will be termed the screen" as distinguished from the screen-l 7 `formingthe body of the screen-frame; The ymesh material 13 of the screen is secured-to frame The screen-frame. is Jfurther pro-V vidediwith side bars 1.6, secured to the-crosspieces 12 .by bolts 17. To the bars 12 are also secured upwardly-projecting plates 18, A

mounted on opposite sides of the screen and in contactwith the side bars 17; Mounted above the mesh material and engaging the e,

same on opposite sides are bars 19, which are removablev by f, loosening thumb nuts 20, whereby the screen proper mayk be, removed and anothersubstituted when desired.

. i `To the'upper surface 'of the frame-bars 10 areatt'ached wearing-platesl 21, which are slots formedin theplates, whereby the latheldinplace by bolts 22, passing through j ter are adjustable for the purposeof varying the action of thejmultiplecam-wheels which engage the said plates. t

, .To thejlower surface of lower members 24 and 25,connected attheir extremities, as shown at 26.

b'ars.10"bybolts 27, while their llower members are'secured totie-bars 28. One lextremv l The upperV members of these 'springs are secured to theV ,Io'o

. Y thebarslOof the lscreen-frame are attached springs 23, located V95 on opposite sides 'and composed of upper and' f ity of each ofAV these tie-,bars issecured' to a l cross-bar 29 of the stationaryrame by means ofb'olts 30.. The ltie-'bars 28 .engage the lower i members 250i the springs 23 and .afford such a support tothe said., springs as to prevent the housing.

any longitudinal rocking movement of the springs 23 during the action of the multiple cam-wheels on the wearing-plates of the bars 10. Attention is called to the fact that these multiple cam-wheels are centrally located with reference to the bars 1() of the screenframe, and the object of the mechanism is to cause all parts of the screen-frame to have a uniform vibrating movement. My improved construction makes this practicable. The lower members 25 of the springs 23, together with their engaging tie-bars 28, are provided with blocks 31, which are engaged by the upper extremities of bolts 32, threaded in the lower inwardly-projecting ends 33 of brackets 34, whose upper extremities are secured to the side bars of the stationary frame 7. The tension of the springs 23 may be regue lated by adjusting the set-bolts 32. The upper extremities of these set-bolts engage recesses 34, formed in the blocks 31. By adjusting the bolts 32 the springs 23 may be kept at a uniform tension, whereby the two springs 23 on opposite sides of the machine may be made to yield equally to the action of the multiple cam -wheels, thus preventing any lateral rocking motion of the screen during the operation of the mechanism.

Centrally secured to the side bars of the stationary frame 7 are brackets 35, which are provided with inwardly-projecting arms 36, occupying positions directly above the bars 10 of the screen-frame. There are two of these brackets 35 on each side of the screenframe. In these brackets are threaded setbolts 37, whose lower extremities are engaged by the bars 10 of the screen-frame and form stops to limit the upward movement of the screen-frame when the latter is released by the cam-faces of the multiple cam-wheels 9. As the upward or reverse movement of the screen-frame is suddenly checked by the stopbolts 37, which are four in number, as heretofore explained, the resulting sudden impact performs an important function in the screening of the material under treatment, as will be readily understood.

Mounted on the stationary frame is a housing 38, preferably composed of sheet metal and completely inclosing the screen at the top, sides, and bottom. The cross-bars 12 of the screen-frame pass through slots 39, cut in the sides of the housing, the said slots being of suflijcient length to permit the necessary vibration of the screen-frame, whose bars 10 are located outside of said housing, being sup-I ported by the extremities of the cross-bars 12, which protrude through the slots 39 of In the treatment of dry material the top 40 of this housing, which is removable, is a very important feature, since it prevents the escape of a considerable portion of the very fine material in the shape of dust. When wet material is under treatment, the cover need not be employed. It must be understood that my improved screen mechanism is adapted equally well for handling both dry and wet material.

In order to better break up and distribute the material over the screen 13, a coarser screen 41 is mounted above the lower part of the screen 1.3 and a short distance therefrom, whereby any material in the form of bunches or balls is broken up and separated, whereby it may be advantageously acted on by my iinproved device. In order to better perform its function, its upper edge is slightly turned outwardly, as shown at 42.

Attention is called to the fact that my improved screen mechanism when in use is suitably inclined, as is illustrated in Fig. 2 of the drawings. When thus arranged, the material is fed to the screen from an inclined chute 43, which, as shown in the drawings, is provided with transverse rods 44, upon which are hung distributing devices 45, which engage the bottom ofthe chute and have a tendency to spread the material evenly over the bottom of the chute, whereby as it is delivered to the screen itis spread thereon at a uniform depth approximately. When it is stated that the screen member 41 is mounted above the lower portion of the screen 13, it must be understood that the term lower is used with reference to the inclined position of the screen mechanism, as just described.

When the material is treated in a wet state, suitable means must be employed for delivering water thereto in such quantities as will best facilitate the progress of the work. F or this purpose a trough 46 is mounted on the stationary frame and extends transversely across and above the screen. As shown in the drawings, this trough consists of a main central part 47 and nozzles 48, extending both forwardly and rearwardly from the body of the trough. The body of the trough should occupy a horizontal or approximately horizontal position when' the screen mechanism is in the inclined position for oper'- ating purposes. Hence in Fig. 5 the trough 47 is shown inclined to the plane of the screen, so that when the screen is inclined to the horizontal the trough will occupy a horizontal position. Water is continually supplied to this trough and delivered to the screen in both directions from the body of the trough, which occupies a central position extending transversely across the screen at any suitable height therefrom. I have also mad e further provision for supplying the material with water, consisting of a transversely-an ranged water-pipe 49, journaled in stationary brackets 50 and provided with an arm 51, provided with slots 52, `through which pass a wrist 53 of a crank-arm 54, made fast to the rotary cam-wheel shaft 8. As the shaft 8 rotates it is evident that partial rotary movements in reverse directions will be imparted to the water-pipe 49. AThis pipe is provided IOO TOS

each' pair are arranged` one in frontof the` of considerable size, which are `controlled by valves 56, pivoted at 57 and normally held in the vclosed position by springs 8. These rwithoutlet-nozzles 55,- sc'rewed into threaded z -v openings formed in the pipe,which is suitably reinforced, as shown at 55a, for the purpose. g

These nozzles are arranged in pairs at suitable intervals. The individual nozzles of other, and they areprovided with openings valves when closed allow -a suitable quantity of water toescape from the pipe. If, however, the escape-opening, whichis designated 59 in Fig. 8, should become clogged, it is only necessary to pull outwardly onthefvalve 56,

when the latter `may'be thrown to the position shown in Fig. 9, whereby any dirt or foreign matter'tending to stop the nozzle-opening may be removed, after which the valve maybe allowed to assume its normal position. It will be observed that as the oscillating or partial rotary movement in reverse directions is imparted to the water-pipe 9 the nozzles will distribute the water forwardly and rearwardlyover the screen in an advantageous manner.

When it is desired to re-treat the material A which passes through one screen, as that wearing-plates 21 are raised somewhat from,` the uppersurface of the bars 10 of the'screen-v shown uppermost in Fig. 2, this material may be carried downwardly by a chute 60, indicated by dotted lines in Fig. 2, anddelivered to another screen of exactly the same` construction located below, except that the mesh of the screen will of course be ner than that through which this grade of the material formerly passed. Thus it must be understood that the material may be subjected to any-desired number of screening actions or operations according to the number of grades, classifications, or sizes desired.

Attention is called to the fact that the l frame, also that the cam-surfaces of the multiple camfwheels engage theextremities of these wearing-plates, whereby when any camtreated isfirst discharged into the chute43,

in which it is separated or spread over the bottom of the chute in an approximately even layerthrough the instrumentality of the i spreading devices 45.

passes to the upper portion of the screen,l

'From this chute it referring to Fig. 2, where it is acted on lby the vibration imparted by the coperating action ofthe multiple cam-wheels 9, the springs 23 and the stops?.l 'g During the rotation ofthe yshaft 8, vupon 4.which the camwheels are `mounted, if the material is treated ina wet state water is constantly supplied to the screen through the instrumentality of `the trough'47 or the oscillating supply-pipe 49,

'or both, as maybe desired; .f The material rejected .by the screen passes over the' lower extremity of -the same. and thence into a chuteV 62, whence it may be delivered to any suitable receptacle.' The material that passes through the vscreen ..13 may vbe discharged fromv the lower extremity of the housing into the chute 60, .whenceuit is ldelivered to yanotherscreen' ofxiiner mesh. Inxthis l,manner the material may be subj ected to any desired number of screening actions, as heretoforel explained.`

Having thus described my invention, what I claim isl. In -a vibrating screen, the combination with a stationary frame, of a screen provided with a frame relativelymovable with reference to the stationary frame, springs centrally connected with the screen-frame and suitably supported,v said springs being composed of members connected at their extremities and supported intermediate their extremities, tie-bars connected with the said springs at one extremity and with the stationary frame at the opposite extremity, multiple camwheels engaging the central portions of the screen-frame on opposite sides whereby the said frame is alternately depressed and released, andsuitable means for limiting the reverse movement ofthe screen-frame.

2. The combination with a relatively sta-l tionary'frame, of a screen, springs centrally connected with the screen and supported from the frame, tie-b ars secured to the springs the said bars being stationary at one extremity, multiple cam-wheels acting on the central portions of the screen on opposite sides, and means centrally acting on the screen-frame in direct opposition to the springs,`whereby the latter are placed under tension,

3. The combination with a stationary frame, of a screen, springs secured to the cen` tral portions of the frame of the screen, tiebars having one extremity connected with the stationary frame and their opposite extremity securedto the springs, adjustable means. engaging the centraly portion of the springs for re ulatino' their tension, and cams IOO rio

acting centra lyon the screenin direct opposition. to the tension-regulating means for imparting a vibratory action to the screen, substantially as described.

s 4. The combination with a stationary frame, of a screen, springs centrally connected withfthe screen on opposite sides, the said springs beingcomposed ofupper and lower separated members, 4tie-bars connected at,

one extremity with the springs and at their opposite extremities with the stationary frame, adjustable means centrally engaging the lower members of the springs, and cams acting centrally on the screen in opposition to the upper members oi' the springs which are placed under tension by the cams whereby a vibratory movement is imparted to the screen.

5. The combination of a screen provided with a suitable frame, a housing surrounding the screen proper, the Jramework of the screen being provided with side bars located outside of the housing, and end bars which protrude through openings with which the housing is provided, springs engaging the screen-frame outside of' the housing and on opposite sides of the latter, the springs being composed of upper and lower separated members, tension-regulating means for supporting the said springs, and centrally engaging the same, tie-bars having one extremity of each attached to the said springs, the opposite extremities of tho tie-bars being secured to a stationary support. A In testimony whereof I allix my signature 1n presence of two witnesses.

NORMAN V. FITTS. Witnesses:

DENA NELSON, IDA J. OBRIEN. 

